blob: d34679f2bd75ea01910acc9f22fff57c3611c705 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
//! Operations on managed box types
// NB: transitionary, de-mode-ing.
#[forbid(deprecated_mode)];
#[forbid(deprecated_pattern)];
use cmp::{Eq, Ord};
use intrinsic::TyDesc;
pub mod raw {
pub struct BoxHeaderRepr {
ref_count: uint,
type_desc: *TyDesc,
prev: *BoxRepr,
next: *BoxRepr,
}
pub struct BoxRepr {
header: BoxHeaderRepr,
data: u8
}
}
pub pure fn ptr_eq<T>(a: @T, b: @T) -> bool {
//! Determine if two shared boxes point to the same object
unsafe { ptr::addr_of(&(*a)) == ptr::addr_of(&(*b)) }
}
impl<T:Eq> @const T : Eq {
pure fn eq(other: &@const T) -> bool { *self == *(*other) }
pure fn ne(other: &@const T) -> bool { *self != *(*other) }
}
impl<T:Ord> @const T : Ord {
pure fn lt(other: &@const T) -> bool { *self < *(*other) }
pure fn le(other: &@const T) -> bool { *self <= *(*other) }
pure fn ge(other: &@const T) -> bool { *self >= *(*other) }
pure fn gt(other: &@const T) -> bool { *self > *(*other) }
}
#[test]
fn test() {
let x = @3;
let y = @3;
assert (ptr_eq::<int>(x, x));
assert (ptr_eq::<int>(y, y));
assert (!ptr_eq::<int>(x, y));
assert (!ptr_eq::<int>(y, x));
}
|
